Detail of "59995-49-2"

CAS Number:
59995-49-2
Name:
2-Cyclopenten-1-one,4-hydroxy-, (4S)-
Superlist Name:
(S)-4-Hydroxy-2-cyclopentenone
Molecular Structure:
Formula:
C₅H₆O₂
Molecular Weight:
98.10
Synonyms:
2-Cyclopenten-1-one,4-hydroxy-, (S)-;(-)-4-Hydroxy-2-cyclopentenone;(S)-4-Hydroxy-2-cyclopenten-1-one;(S)-4-Hydroxy-2-cyclopentenone;4(S)-Hydroxy-2-cyclopentenone;
Density:
1.299 g/cm³
Boiling Point:
243.7 °C at 760 mmHg
Flash Point:
99.9 °C

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Optically active 4-hydroxy-2-cylopentenone: Optically active 4-hydroxy-2-cylopentenone. Minamii, Masayoshi; Ueda, Yuji (Sumitomo Chemical Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 61236742 A2 22 Oct 1986 Showa, 6 pp. (Japan) CODEN: JKXXAF. CLASS: ICM: C07C049-707. ICS: C07C045-78. ICA: C07B057-00. APPLICATION: JP 85-77259 11 Apr 1985.Several reagents with their cas registry numbers 59995-47-0 and 59995-49-2 are used here. DOCUMENT TYPE: Patent CA Section: 24 (Alicyclic Compounds) The title compd. (I) was prepd. by resoln. of racemic I with (1R,5S)- and (1S,5R)-6,6-dimethyl-4-hydroxy-3-oxabicyclo[3.1.0]hexan-2-one (II) in the presence of p-MeC6H4SO3H (III) or PhSO3H with azeotropic removal of water, and hydrolysis of the obtained (1R,5S)-6,6-dimethyl-3-oxa-(4R)-((1R)-4-oxo-2-cyclopentenyloxy)bicycl o(3.1.0)hexan-2-one (IV) or (1S,5R)-(4S,1S) isomer. Thus, refluxing 200 mmol I with 118 mmol (1R,5S)-II and III in benzene for 4 h gave a 1. mixt. of (1R,5S)-(R)-(R)-IV (V) and (1R,5S)-(R)-(S)-IV, and after sepn. by column chromatog. 3 g V was hydrolyzed in water to give 1.25 g (R)-I. .

Optically active 4-hydroxy-2-cyclopentenone derivatives: Optically active 4-hydroxy-2-cyclopentenone derivatives. Okamura, Noriaki; Nishama, Toshimi; Okamoto, Yoshio; Hatada, Koichi (Teijin Ltd.Several substances are used for example 59995-49-2 which is its cas registry number., Japan). Jpn. Kokai Tokkyo Koho JP 61267536 A2 27 Nov 1986 Showa, 13 pp. (Japan) CODEN: JKXXAF. CLASS: ICM: C07C049-703. ICS: C07C045-79. ICA: C07B057-00. APPLICATION: JP 85-42592 6 Mar 1985. DOCUMENT TYPE: Patent CA Section: 24 (Alicyclic Compounds) Section cross-reference(s): 29, 33 Optically active 4-hydroxy-2-cyclopentenones I (R = H, protecting group), useful as synthetic intermediates for prostaglandins etc., are prepd. by optical resoln. of the racemates with polysaccharide derivs. Thus, 0.1 mL racemic I (R = Me2PhSi) was chromatographed on a 25 wt. % supported silica gel column which was treated with cellulose tris(phenylcarbamate) and H2N(CH2)3Si(OMe)3 to give (S)-(-)-I and (R)-(+)-I (R = Me2PhSi). .